/*
 * Copyright (c) 2011-2012 Alexander Dubu
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * o  Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * o  Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * o  Neither the name Axil nor the names of its contributors may be used to
 *    endorse or promote products derived from this software without specific
 *    prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
package axil.stdlib.numbers.type;

import axil.api.AxilObject;
import axil.framework.type.NativeEquivalent;

import java.math.BigInteger;


/**
 * Type metadata for the big-integer object. Do NOT create an instance of this
 * class. No good can come from it. Only access to the type metadata from the
 * value class.
 */
class BigInt_Type extends Num_Type implements NativeEquivalent {
	BigInt_Type() {
		super("big-integer");
	}


	/**
	 * Tell the magnitude of this numeric value. This is used in all arithmetic
	 * computations to ensure like objects are used.
	 */
	public int kind() {
		return Num.BIGINT;
	}


	/**
	 * Get the list of native Java types that this type is equivalent to. The
	 * list returned is never null nor empty.
	 */
	public Class[] natives() {
		return new Class[] {BigInteger.class, Long.class, long.class};
	}


	/**
	 * Parse the given text as a representation of the canonical form of this
	 * type. A null is returned if the text does not represent a valid object.
	 * The string given cannot be null.
	 */
	public BigInt parse(String text) {
		BigInt v = null;
		try {
			BigInteger i = new BigInteger(text);
			v = BigInt.from(i);
		} catch (NumberFormatException e) {
			// IGNORED
		}
		return v;
	}


	/**
	 * Transform the given native object into its equivalent value object. The
	 * object given is never null and is guaranteed to be one of the alias types
	 * indicated by this object's type (as reported by the type() method).
	 * If the object is one of the common types, then that indicator is also
	 * given.
	 */
	public AxilObject transform(Object object) {
		if (object instanceof BigInteger) {
			return BigInt.from((BigInteger)object);
		}
		return BigInt.from(((Long)object).longValue());
	}
}
